At a roadside alcohol check, a driver tests above the maximum permitted level. Must a second test be carried out?
Human factor: Alcohol, drugs, and medications
Explanation
When a driver tests positive in a breathalyzer test, meaning above the maximum allowed level, a **second test** is necessary. This second test is conducted to **confirm** the initial result and ensure there are no errors in the measurement.
- The first test is performed by blowing into a device that measures the amount of alcohol in the blood. If the result is positive, the test is repeated to verify the accuracy of the result.
- This second test is important because it serves as a **contrast** to confirm the driver's condition and avoid possible errors in the initial measurement.
Therefore, a second test must always be conducted when the initial result is positive, regardless of whether the driver shows obvious signs of having consumed alcohol.
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